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1 <br /> Ground Water Extraction Feasibility Test Report <br /> LOCAL FOOD STORE <br /> ' 2650 Monte Diable Avenue, Stockton, California <br /> ' 1.0. INTRODUCTION <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this ground water extraction test report for <br /> ' ' 2650 Monte Diable Avenue, Stockton, California The site setting is Illustrated on Figure 1 Site <br /> structures and monitoring well locations are depicted on Figure 2 This report has been prepared in <br /> accordance with guidelines established by the California Regional Water Quality Control Board - <br /> Central Valley Division for investigation of underground storage tank(UST) sites <br /> The objective of the test was to obtain general ground water aquifer characteristics and to evaluate <br /> aquifer response to ground water extraction at a constant pumping rate <br /> r , 2.0. BACKGROUND ' <br /> The following are milestone events in the soil and ground water investigation at the site <br /> • 24 March 1999 three USTs, dispensers and piping were removed from the site Total <br /> ' petroleum hydrocarbons quantified as gasoline (TPH-g) was detected in the UST 'grab'- <br /> water samples at concentrations up to 950 Im;lligrams per liter (mg/1) Benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX) were detected at'concentrations up 'to 62,900 4 <br /> microgram,'per liter (µg/1) Methyl tertiary-butyl ether (MTBE) was also detected at <br /> concentrations up to 32,650 µg/1 in the water samples Total lead was,detected in the same <br /> samples at concentiatlons up to 0 $6 mg/l <br /> 4 <br /> 13 April 2000, ten soil probe borings (Bl through B10) were advanced at the site TPH-g, ' <br /> BTEX, MTBE and/or tertiary butanol (TBA) were detected in each of eight grab bround <br /> water samples Low concentrations of TPH-g and BTEX were detected in soil samples <br /> ' 'collected,from four of the ten soil bonngs Significant concentrations of MTBE were <br /> detected in soil samples collected from a boring advanced near the former tank pit <br /> - '23 I I <br /> May 2000 three ground water monitoring wells (MW-1 through MW-3),were installed, <br /> fn 02 October 2000, one ground water monitoring well (MW-4) was installed,Iand <br /> , • f I i " <br /> Quarterly ground water sampling and reporting has been ongoing since June 2000 <br /> I I <br /> I j The approximate lateral extent of impacted soil;and ground water has been,defined by the installation - <br /> I I of soil borings and the current monitoring well network 'The vertical extent of dissolved <br /> hydrocarbons m,the;former UST area may require additional assessment i <br /> V „ r <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />